Unique WS Series, Руководство по обслуживанию

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WS
Series
Advanced air conditioning systems
11. CONTROL PROGRAMS and OPERATION INSTRUCTIONS
11.1 General
Protection: The air conditioner is protected by pressure and temperature sensors. The
sensors cut off the unit once extreme and dangerous conditions are detected. The DISPLAY
on the thermostat indicates the failure code as stipulated in the troubleshooting section.
Restart after power failure: Back-up memory keeps the working data. Once power returns,
the air conditioner will restart and return to its saved data.
The unit can be modified to fail-safe manual restart after power failure (Start-Stop).
Instructions for such modification are available upon request.
Reset and restart after failure:
Once the unit has stopped due to failure, restart is possible
after resetting. Reset the system by pressing ON/OFF button on the room thermostat. Call
the technician for assistance should the failure be repeated.
Restart time delay:
Compressor starting time delay is 1 min. at first start and 3.5 min. before
each restarting. Timer accuracy is ±20 sec.
Evaporator fan control (only for Heat Pump unit): In cooling mode the fan runs
continuously. In heating mode the fan stops running 15 sec. after compressor stop.
Evaporator fan control (only for units with electrical heating elements): In cooling mode
the fan runs continuously. In heating mode the fan stops running 40 sec. after the heating
elements are turned off.
Water temperature control (only for Heat Pump unit): Compressor stops if water
temperature reaches below 4ºC. Compressor restart enabled at water temperature above
10ºC. Failure in water temperature sensor does not stop unit operation. If failure occurs 3
times per hour and/or holds for 1 full hour, signal of failure
ER8 will appear stable and On/Off
press for re-start not allowed. Re-start only by shut-off and switch-on of power supply.
Heating control (only for units with electrical heating elements): The return air
temperature sensor switches ON the first heating group at room temperature 1ºC lower than
the set temperature. Heating is switched OFF at set point.
Second heating group is switched ON at room temperature 2ºC lower than the set
temperature. Second heating group is switched OFF at 1ºC under set point.
Evaporator coil temperature control: Compressor stops at coil temperature below 0ºC.
Compressor restart enabled at coil temperature above 8ºC.
Failure in evaporator coil temperature sensor does not stop unit operation.
Return air temperature sensor:
T
hermostats include an incorporated, build-in temperature
sensing element. However, an external sensor (optional) can be added. In such case the
operation of the unit is governed by the selected sensor.
The thermostat temperature setting range is
16ºC
to
30ºC
.
Failure in return air sensor will cause the compressor to run continuously. If unit was set to
"AUTO" operation mode, the compressor will not run.
Air-Flow protection (only for units with electrical heating elements): To protect the
heating elements from overheating or from operating without flowing air.
A combination of differential pressure flow-switch (for heating elements larger then 12KW)
and temperature sensor immediately cut off the heating elements in case the temperature or
air-flow reaches the pre-set protection values. The fan continues running for additional 15
sec.